Earnings per Share (Details 2) - shares		3 Months Ended		12 Months Ended
	Aug. 06, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Common Stock Outstanding [Roll Forward]
Outstanding, beginning of year		5,441,190	5,233,986	5,233,986
Issuance of stock: 4% stock dividend		0	209,359	209,359
Purchase of treasury stock	(8,635)	(8,635)		(2,155)
Outstanding, end of year		5,432,555	5,443,344	5,441,190